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    "***一、向量是多维空间中的对象***\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6cd75be5",
   "metadata": {},
   "source": [
    "***二、二维世界中需要使用两个信息来描述其具体位置***\n",
    "1. 水平位置\n",
    "2. 垂直位置\n",
    "\n",
    "***三、为了描述点在二维平面中的位置，还需要一个参考点：原点***\n",
    "\n",
    "***四、二维向量是平面上相对于原点的一个点***"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "960c72d7",
   "metadata": {},
   "source": [
    "![jupyter](./images/img2-1.png)"
   ]
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